Drawing-board.



No. 058,072. Patented sept. la, |900.

0. K. mcn.

DRAWING BOARD.

(Application led June 21, 1900.) (No Model.)

Y i z 19 i NITED' STATES PATENT OFFICE.

GEORGE K. RICH, OFPHILADELPHIA, PENNSYLVANIA,

DRAWING-BOARD.

SPECIFICATION forming part of Letters Patent No. y6t' 8,0`7f2,`datedSeptember I18, 1900.

Application filed June 2l, 1900.

To all whom it may concern:

Beit known that I, GEORGE K. RICH, of the city and county ofPhiladelphia and State of Pennsylvania, have invented an Improvement inDrawing-Boards, of which the following is a specification.

My invention has reference to drawingboards; and it consists of certainimprovements fully set forth in the following speciication and shown inthe accompan yin gdrawings, which form a part thereof.

My present invention relates to improvements upon the class ofdrawing-boards set out in Letters Patent No. 634,836, dated October 10,1899, and granted to me.

The object of my presentinvention is to provide suitable means, moreespecially adapted to large boards, to facilitate the insertion andremoval of the paper, and also the means for adjusting the T-squarerelatively to the scale-markings of the apparatus in the act of drawing.

In carrying out my invention I combine the movable supporting-board,upon which the paper is placed, with means adapted to support said boardin a lowered position, so that the paper may be freely removed from saidboard or inserted thereupon below the inwardly-directed clamping edgesof the over-- hanging shoulders of the guide-plates, the constructionbeing such that after the proper adjustment of the paper thesupporting-board may be raised so as to positively clamp the paper inposition and bring it substantiallyon a level with the surface of theguides to enable the T-square to pass directly or closely over it. Thescales are suitably attached toy the upper side and end edges of thedrawingboard, and the T-square, which is adapted to the guide edges-ofthe guide-plates, is provided with an adjustable guide locatedimmediately above the said scales and adapted to have its adjustableedge set nearer to or farther from the T-square, so that with theT-square set on any givenv line of the drawingboard said guiding edgemay be adjusted to a given part of the scale to facilitate the drawingof a subsequent lseries of parallel lines equally spaced apart.

My invention also comprehends details of construction, which, togetherwith the above SerialNo.21,057. (No modelo v features, will be betterunderstood by reference to the drawings, in which- Figure 1 is a planview of a drawing-board embodying my invention. Fig. 2 is a longitudingsectional elevation of same on line 2 2. Fig. 3 is a transversesectional elevation of same on line 3 3. Fig. 4 is a cross-section ofsame on line 4 4, and Fig. '5 is an enlarged plan view of a portion ofone of the scales.

A is the main frame and is made box-shaped for convenience and toprovide a casing into which a suitable drawer J may be placedsaid drawerbeing adapted to hold the drawing in-` struments and T-square when notin use. The said main frame A is closed on three sides,

but its lower side corresponding to the front end K of the drawer isleft open to facilitate the insertion and removal of the paper. The

upper edges of the three closed parts of the frame A are provided withplates B, which 'have inwardly-directed and overhanging vguide edge Z),which is received in the groove kr on the head of the T-square R.wardly-extending 'guide edge b is also adapt- This uped to guide `anyordinary T-square, if so desired. By this construction the top or endand two sides of the drawing-board are provided with overhangingclamping-shoulders jand guiding edges for the T-square, and two .of saidparts-namely, the top and one of the lsides--are provided with scales D,itA being unnecessary that the scale should be placed also -in the otherside.

As shown, the scales D are made with beveled side edges `Dandspring-clips d and have their edges passed through apertures in theplates B and sprung over the beveled edges of the scales, as clearlyshown in Figs. l and 4. In this manner the scales may be held I providethe marking of my scales in the manner shown in Fig. 5, in which oneedgez of the scale is marked with the usual subdivisions of inches andsixteenths of inches, as`

indicated at D2, and the opposite edge also divided into siXteenths, butwith the said marking shifted out of alinement with the markings on theother edge to the extent of one thirty-second of an inch, as shown atD3.

As the part S of the T-square has its upper edge movable over both ofthese markings,it is possible to readily adjust the T-square to anythingup to a thirty-second of an inch.

Referring to the construction of the T- squa-re R, adapted to thisboard, the head is provided with the downwardly-directed V- groove r,before referred to, which enables it to readily adapt itself to theupper guiding edge ZJ of the guide-plates and at the same time permitsthe quick and easy placing of the T-square in operative position. Thehead of the T-square is provided on its under side with a guide-groovetransversely to the length of the T-square and in which a sliding plateS fits. The said sliding plate has an upwardlyextending stud s, whichpasses through a slot in the head of the T-square and receives a milledclamping-nut T, as clearly shown in Figs. l and 4.-. The upper edge ofthe plate S is made straight and parallel to the drawing edge of theT-square and is adapted to move over the scales D. By loosening the nutT the guide-plate S may be adjusted to the scale without moving theT-square, and whenclamped again in position-it Will move with theT-square for the purpose of drawing parallel lines of definite distancesapart from any given place'on the scale. This obviates the necessity ofshifting the entire scale to adjust it to a guide edge on the T- squareas employed in my other patented device. The present method is farsimpler, more correct, and more quickly manipulated.

By an examination of Fig. 4 it will be ob` served that in my preferredform of T-square the guiding-head, which is of metal, fits down dat uponthe upper surface of the guide-plate B, and the drawing or wooden bladeR is fastened to the under part of the head and substantially fits downbelow the upper surface of the guiding-plate, so as to rest directlyupon the paper.

In large frames and especially where loose sheets of paperare to beclamped in position it is difficult and unhandy to insert or remove thesame Where no provision is made for holding the supporting-boardtemporarily in a depressed condition. I overcome this difficulty byproviding suitable means for lowering the supporting-board E and holdingit in a lowered position while adjusting the paper sheets e. As shown,the board F is provided at two opposite edges with locking-platesf, Which when the board is depressed snap under springbolts G.Thesespring-bolts are pressed inward into locking position by springs Gand are made in the form of levers pivoted at g and adapted to beoscillated by push-buttons II, heldin suitable guides h in the sides ofthe main frame A. The general construction of these spring-bolts isshown in Fig. l, where it will be seen that a single push-button II isadapted to Withdraw both bolts at one side of the frame. `The sameconstruction is employed on the opposite side of the drawingframe, asshown in Fig. 3. The supportingboard Fis normallypressed upwardlybysuitable springs I; butwhen itis desired toloosen the clamping actionon the paper the entire board is depressed or, if desired, one sideiirst and then the other side until the plates flock below lthespring-bolts G. In this lowered position of the supporting-board thepaper sheets e may be inserted or removed at will. After theproperinsertion of the paper the push-button H maybe depressed and thesupporting-board thereby liberated. It is advisable in making thisadjustment to retain the edge of the board being liberated by a slightdownward pressure at the time of pushing in the push-buttons to readilywithdraw the bolts and release the board, which may then be permitted torise into clamping position without disturbing the paper.

I do not limit myself to any special construction for the means forlowering or raising the supporting-board, as it is evident that numerousways of sustaining and operating this board may readily be adapted tomyimprovements; but 'the construction which I have shown I have foundexcellently adapted to the purpose in the practical embodiment of myinvention in use.

The lower part or end K of the drawer is provided on it-s upper edgewith a plate B similar to the plates B, with the omission of the outerguiding edge b, if so desired, the object being to provide an additionalshoulder at the lower part which may also act to retain the free edgesof the paper and prevent any possibility of accidental tearing orrupturing of the said edges. Furthermore this construction imparts afinish and fine effect to the drawing-board as a whole, and in additionthereto makes a tight and dust-proof joint at the lower part to keepdust out of the drawer.

While I prefer the constructions shown,I do not limit myself to theminor details thereof, as these may be modified in various ways withoutdeparting from the spirit of the invention.

Having now described my invention, what I claim as new, and desire tosecure byLetters Patent, isy l. In a drawing-board, the combination of amain frame having inwardly-directed overhanging shoulders, avertically-adj ustable paper-supporting board adapted to support andpress the paper upward against the overhanging shoulders, andhand-controlled devices for retaining the board in a depressed conditionso as to permit easy insertion or removal of the paper.

2. In a drawing-board, the combination of a main frame havinginwardly-directed over= hanging shoulders,a vertically-adjustablepaper-supportin g boardadapted to .support and press the paper upwardagainst the overhanging shoulders, hand-controlled devices acting onopposite edges of the board for retaining the board in a depressedcondition so as to permit easy insertion or removal of the paper, andspring devices for pressing the board upward to clamp the paper whenreleased from the hand-controlled retaining devices.

3. In a drawi ng-board, the combination of a main frame havinginwardly-directed overhanging shoulders, a vertically-adjustable boardfor supporting the paper and pressing up against the overhan gin gshoulders, spring devices for moving the said board upward,spring-latches for locking the board in depressed condition, andprojecting hand-controlled means for operating the spring-latches.

4. In a drawing-board, the combination of a main box-shaped frame openupon its upper central part and one end, guide-plates secured to theupper edges of the box-shaped frame and provided with overhangingshoulders extending inwardly on the two sides and one end of the frame,a vertically-adj ustable supporting-board for the paper adapted toA aframe structure for supporting the paper and provided along one or moreoi' its edges with a guide-plate having an upwardly-extending outerguide edge for a T-square, a longitudinal scale arranged in a recess insaid guide plate and having beveled side edges, and retainingspringclips passed through apertures in the guide-plate and pr,0-ject-ing over the bevel edges of the scale to hold it in position whilepermitting longitudinal adjustment.

The combination ofadrawing-board hav ing a guiding edge, anormally-stationary scale arranged on the drawing-board parallel to andclose to its guiding edge, a T-square having a head adapted to theguiding edge of the drawi 11g-board and also provided with a transverseguiding portion immediately over and parallel to the scale, a slide Sadapted to said guiding portion of the T-square and having anupwardly-directed adjusting edge arranged immediately above the scale ofthe drawing-board, and an adjustable clamp for holding the slide firmlyto the T-square,

whereby the T-square and the adjustable slide are adjustable relativelyto the board and over the scale thereon and the slide is relativelyadjustable also to the drawing edge of the T-square.

7. In a drawing-board, the combination of the main frame, a guide-p1atesecured to the upper edge of the main frame and provided with an overhanging shoulder at one side and an upwardly-directed guide edge at theother, means to clamp the paper against the under edge of theoverhanging shoulder, and a T- square having a head guided upon thesurface of the guide-plate and provided with an eX- tended inverted-Vgroove r adapted to receive the upwardly-extending guide edge of theguide-plate.

8. A drawing-board having a guiding edge and a scale close to saidguiding edge, combined with a T-square adapted to said guiding edge andhaving close to its head aguiding-groove transversely to the drawingedge of the T-square, a slide S adapted. to said guide-groove of theT-square so as to move only at right angles to the drawing edge of theT-square and provided with an upper guide edge parallel to the drawingedge of the T-square, and a clamping device between the.

slide and the T-square for holding the slide in adjustable position uponthe T-square.

9. A drawing-board having a guiding edge and a scale close to saidguiding edge, combined with a T-square adapted tovsaid guiding edge andhaving close to its head a guiding groove and slot transversely to thedrawing edge of the T-square, a slide S adapted to said guide-groove ofthe T-square so as to move only at right angles to the drawing edge ofthe T-square and provided with an upper guide edge parallel to thedrawing edge of the T-square, and a clamping device consisting of aclamping stud and nut secured to and movable with the slide foradjusting it and extending through the slot in the T-square.

10. In a drawing-board, the combination of a rectangular frame havingoverhanging shoulders on the inner edges and also a guiding edge, alongitudinal scale along one of its sides, a clam ping-board forremovably clamping paper against the under side of the overhangingshoulders, a T-square having a metallic head and a long ilexible woodenruling extension, a slide adjustably clamped on the head and guidedtransversely to the length of the wooden extension and so located on theT-square as to come immediatelyover the longitudinal scale in the frameof the draw- IOO IOS

IZO

ing-board, and means carried by the slide for GEORGE K. RICH.

Witnesses;

R. M. HUNTER, R. M. KELLY.

